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Diesel Addict
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with the ppe on both off my trucks i gained 3 to 4 on the 06 lbz 2500HD crew cab short bed best yet is 23.2 all highway average speed was 73,then on 05 lly dually i went from 15.7 highway to best yet 23.6 on the highway average speed was 70.i noticed the biggest milage gain doing the straight exhuast and programmers on both trucks.
 
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